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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d67288a7cf36fbf92bd4d236f35fb319f7d94894cea4fffcc69fa0171108db2' 
  AND token = 'Ch1od0rPI0zm/jhM+ufIi8Ru0SaERwBR1KhUPWLuBZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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