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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba16440f2e006b6dc0d426df3962f3ff0072d2d17106c45e655e15555c9de508' 
  AND token = 'yAKpOAWI5MoOLiyYT+j1C6KETbtsF2PwidG/Pqe2DLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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