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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ce3207fa9aa56b08d6965578188d78ae48e715b1418571e68dcd18afe37295' 
  AND token = '8PvAVfK188Nu7b1ODgoQh2Am6PekGdocgbER6iuNYo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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