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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0524e7679f8d8ff153e5cc798f584b9965b747e65657fc2be4a4f15ad0b4674b' 
  AND token = 'POIWQSUddbUhfaHHjNZ4ieSEhY/KfP6dpwjO9oV8sBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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