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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5bdcf32f0ffe20d7f3fe3126d10dbf5707710f00f13bc84a86f9b105d29db7' 
  AND token = 'r4a0X3nDIAky+xIvGRUwkMe6A66x091mW4IYelq00Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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