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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4219fb5e1be8716d902cdfc9a2c352df68002e11c7d9d67859d6d85c2b627d1' 
  AND token = 'fTlWjrNTVw9keQ94RAIS1UCbSWOOZUot6fzuV1wpaik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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