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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ad9fb259250d9bd87a1eb6c60571e8d65350894e3748dd5367c116666e91df' 
  AND token = 'h4w7qGx38+7wUblPO2OU639PhITAJe1gDSttbxmW7vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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