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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0bef6194ad03f3badb99dc8d05c5875dde3fa21d90738fdc874db5c0032b2a' 
  AND token = '1VFG6Kbz1tW8DdlzL6S1f63YEzXXzJMTHy094AsctTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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