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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83963842e5322ff9c819357abef3ff8ad247232361185ab175aee6811e4dd399' 
  AND token = 'Wf7mBsbUtJnFPhnvn2BM0aIDuew5Z1X+ScQsKc9PhoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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