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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c07e53d5e73ed63d51a1e3b7058abe48846b813fcfc5d8efc7a283f1d00cf0' 
  AND token = 'vsO6rw0vwPjyHaVhwUl0gKg1xyCNmQGwzypz6PTQUyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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