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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01939b7d2cb953b2165f5c622c57e0f570477d2818c67c4fe54e6879d9e6e5e5' 
  AND token = 'JeuWyotnV7B+s4aNjG2C0VZOgbx3bWiZCFeluBxLOro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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