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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c2f18d9821cf8afcf5ebc91b46bfb06d2e408832475bbf480a0f70ad931c9a7' 
  AND token = 'yvAvMZcdIXHxAMjsKENpsLkdKe62dBpX9i0r1Tm5wdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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