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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41eeed9580a80fa13da0e374ef4027ca37a7412f38d30295f4bb8e06f5f64eb1' 
  AND token = 'T+pr2JHXqtYVfbrt+Do2Em02doP7r140e1rLNC1dYxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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