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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912c5d92343596049c298a4d61193ae1af5ff1cb0183a6ee66bb0574a2bb47b9' 
  AND token = 'YUwCH8V1FPj110BtyjdilFCaeouxVrAA+cjIaD1LlMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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