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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4760d66e9961ff533163a366b08e0a67ec8b870c4cb8d228f3d191e77de60a6e' 
  AND token = '/mWUj15beM2NFxU2yFLKI09pjCxYktBmyombceK6bWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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