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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91ea4b91ea124810ee7ad3e4dd5e9a1423559042635b3689081e9393de44f1f' 
  AND token = '9jfK+sXrPuyML7IS26Yb/FFAcJwP24wFhaaD9KKxsBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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