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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2653e967495bc47c6ff6e81ba9be0f8274ad9647c34783b259cd36583e470c' 
  AND token = '/TxHrNJ0W/IFFt7pX3cevC6rzewu9ZoZO2oVJhthEbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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