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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3129ac7b0bfd16c46ebd903d9c6c8bb59c1b29fc8a66619cbdc3dbd659c9ff0' 
  AND token = 'nT/RAnf4DywXN1R8dEOommJJqDM35MAjKcOfmizCVnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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