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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b6db6ce02a2cf2df130a0d54fdaacb3b4c5be07c374ce7a5c3f2efe9d265b8' 
  AND token = 'rxtDIWLluT2oXor2tO0XGARzd2jaWwFI0prlCyB7YhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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