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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84c1abb05ea946ee321bb91bfaa31b656b49acee8087d072fcb9f9801779d0e' 
  AND token = 'vWVnBbQqFgVTIeTpE+XoOj6M81jtk6xJC2PypyzL1i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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