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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d31c0b5d8f7f03874a1a9d364c02f1ac3460a757b6ccce5c023ab13acb01f67' 
  AND token = 'suMcYAD6870MgO+9otl4kCs+ojrAQC3hb7xMjaPSILg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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