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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa39836033980e672cc77a41bc311eac046270ec36f8fa1dadf1ccf406109d71' 
  AND token = '8m8Uf1qt6qoq5UWwuBs08MFU8PBz9WE/rdJ1SJ9FEms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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