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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c4a6d7eb32ab3528920eb7ebb966e52dce3b9a37fc4dfdf8e6e76f5efd0c71' 
  AND token = 'O9SE0LmUFRKDv0P1EL+bNxVQ3bw8Hmx3ZUVTTN2Z88w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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