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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb106d0c32d0d5593ed12ea63fb41999ad107b45fa89dcf3999fdbf2b707c32' 
  AND token = 'rsSZ2hqFMC9GILhpGoQZw4N3Et1MgC6TE1ZFxoGjIwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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