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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101035ee95b89a052b482a2d0c0e4a5ad0aa879b759a99bc1c0c2e739fb41ac1' 
  AND token = 'wbSc80fYlkiP4BLSiTK41wSSHloTbXAaLgdHLMu8BJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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