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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b120c14c9ee1ce1cc8d484c58dc83f81509c6a39b6b4179ec0e009e7bc568eb0' 
  AND token = 'ducAbTmYaZQf5NliSVmXhMkuDcEd1SvAq2Sj7mvYSm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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