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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e9b473aba6c85120e95ae03d074daf6033cf8234d25f2fb8c786bfc8927950' 
  AND token = 'tvR31bJeBdehBatVKaUyKJO+dcVLvDC7IO/NXlO9db0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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