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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683c56667ab5ed838de16f687a36d775977bdd468f5646b1587db0e0ef3584c2' 
  AND token = 'Qzamazu/bhk5sbf0TvPwqOPj7sgnnWRlSSp8UKbrow0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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