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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfcfda9db76297dd9cb66c90956ab9a3914341eff1b4381b7c7991e05612bd4a' 
  AND token = 'eQWmrqxH8UvSJxtyAVQLlGrJurr3L0bt0152BJHICmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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