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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6a9f83940ca0bfe57f51b9f4d8486601a48f46c704b8903ad6c8cf106bbbc2' 
  AND token = '8QRXk0ToD513suRR5nk91Mr/F7Tftd/hXLnjQ5ERiC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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