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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038f636bc08dc1d47a81952e28e3c2d9c69aa9e5a47a9fbed8e35df9d3f0fdd3' 
  AND token = 'kT63uP4zGH2ABIfnDdOEYZN85R6DeNp+Gu/gkLYrUQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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