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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8528daf57ab7a8a1e211025b6038903b87eafbf5b931101c5029d142a39069c' 
  AND token = 'S+/UkBKAZ/xMJu6oyn8JqzxrslTIdWcztX/iXptpSSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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