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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5e46d97c9757e07a833fde13760259e61fbec4c3e83b1eb48007ea6e7167fe' 
  AND token = 'Bkuofh3nBun/ZqUVQuZleAwTxqc3dHowxyQdgw+927c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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