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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c9fb9039f8e663c3b4af407b786b08bfb5a639bb846d4bb24ad869a95e3321' 
  AND token = 'QMOuzzWCW/YUj8d59C2DomOEX8XBrcfYPueVmEQkoS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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