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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982974f49fc7ab73fb6e4f950852c17b1d8ec88744f30c3b88bc13dd46f26005' 
  AND token = 'fxui03OGoTyckk3tV3oz5gb9rjih6u3ZLt3gwnsm+ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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