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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e71905b9543085156875c8d0f10db0748a0f69f0421ac8948009dd7623fedf' 
  AND token = 'hd0AFke8v0gGQIgs7vflY3xf32xi8CQz37/AK2VsnIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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