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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84619cee415756cd5313d7b7bbf3ef79a026d90345ad423f0a38043b2f6d5596' 
  AND token = '5hthRpHu5sy2fjFzkkaNhpSdBhSVhHwYxBRrhJAuZXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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