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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b293498b1a0adef8aa9dbdceb2c61de57d7bbb64a4ec87ffc7468fa9f06a2a99' 
  AND token = 'gWAfoNPJxp7rXNJxkAg0sAw9luE+ciHsJPmAfGxDBCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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