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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd053c7c1886179841fc415e8a8ad320a9ab8d0b6a665df738485303dd0199e38' 
  AND token = '8BWmHLznZn1nNdpRKzVuPC+8OVmZS6KXo4+lbHdE+QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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