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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec38c9586fac82847f8b8cf59ec0b11fabd3a661e094577faf9a8d984e879eba' 
  AND token = '+5MO7yAOFdm3Vge3A/A9AL5i0cFGvR0TxrPZWl2FJ8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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