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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a8a51e7f0726b9b974f11e52030504e4b08099b31035ae2b3152985a686c2d4' 
  AND token = 'bsj5RYKSDieZqhVigspd/P39F67f1StLXAy8nWj1lCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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