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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98765eaa21131ad7c340e18c52a8f5bc9119bffb1870305741bc41b9529465d5' 
  AND token = 'pIL3YT6oLhvmj3Bqwk9Gcc/ca5PHNMeRnkQEHS0Pt3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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