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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cbbc769ccec739d203c442b0bb057f4590621f71768cfecff96c0aba3e6b633' 
  AND token = 'LOUyVpVejpE0b8ZLad+/tXzYlntqIkvs+rPy87x/N1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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