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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92c73fb298d23e949440e734510a0cfc052748f05dda97146dbd74939ae5c48' 
  AND token = 'A0wujIckIipQQj9OPOep3atJYz1iigKjo6nUV4zjaAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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