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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99ce756cdb11993e1586ae1c54db1d4fe1afefaaffeb5f8b06ca51c171a221a' 
  AND token = 'FI9rBFnHJ2tb/zlmdB9GpZYQ8tGJhtJs6OCdPuo4gHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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