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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d6be3129748df3f79e89381aa497d2ad4fe280b8e22ad366cb91de57239b6a' 
  AND token = 'oeGewVNfbf3QEo48Mteg+MYVrJT7UNnxoBN9CVelu+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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