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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd769c6565f64433f890ccb67af2335a528e7ff11de0785323750c9445600a0' 
  AND token = 'YKueN6/aywRMaSoGpnlzBMKr2T5Bkw6k6B4tPsg9ODM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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