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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5609a8b75026751dd8318b39c3f8606516e31894a5db318fc891941bcb8737a0' 
  AND token = 'NDRiRTzWDHrzOJbuf/A9JHFJ1l1rV8IsLgxEnclQd+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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