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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e92a5d61ca1685a452439a1114461ddefa9889bcc8f2c2930617f89ee7d3cae' 
  AND token = 'Wtz0iJ91Uusj1z6dmF3QGNlMxx1njodsFkVHI/sKw3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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