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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42d3c5d7ca5bc04803a8fb2a8e0543ad68b27630e865b4a7cb531b5f2a68ae5' 
  AND token = 'tWfk24ncBgT+7M7x8YG9Y2xO1fA1mB40f+m1R4o/4sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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