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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b56cdabf4841ec35186f5c1bb2684b217fe90be2e1e4ea32d5a69ecf929994' 
  AND token = '6VUGwXFHsx/EJ0b7E3a00hl91UOIIGKhkDN/a6o1bYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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