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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aae4fb032c24c9ca4fbeeec70460254cf4ddf65e3d9490cced7193c6d63c982' 
  AND token = 'Rirl6DVHiRBx9U7jAMpBQtT5ZpKSIfqJUACp0M9h5TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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