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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7039f21cc59b70f49dc643c44910cfbe47a45b5028f2f3bab7f4f3296fe81461' 
  AND token = 't67yZtdFM/gDjRmcasQ2NPX83riewZuI56Qx7gafXmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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