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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313039161b4965cab116c0632dc2eea41bab1393590cfe77b04e9fb2f9ee7531' 
  AND token = '2PYwrGidgLVlAxpWmyhVuPoZTlm0BWQ3iWpBSMyufGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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