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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af1af5c4817d6ab588b2b6574757d3379227f13963dde2e7eda48e82b772a36' 
  AND token = 'iqOMY4QmUOobVX6nFdH9bqolkekMCPp7gdTVPbPgjlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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