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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a163b575001f81b0dbae3eb473b3928bfe54145d7e4e7ff9694be37eb326a9e' 
  AND token = 'OUiNqpjzLMi1QbnL0GyzjpMKpD66+WDW8oxV3idw3M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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