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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2961dc22e3127a812c7166533b389f059b805aa5d0091eae70347791bc2007' 
  AND token = 'Es2vmA3fhz3tGcrN9Kr9rWMhTmD5CFl3q3YyLwRu/nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}