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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51806af3b586ed9ed14692c6e211bac1661edbffe079c47a7e580621796eaee3' 
  AND token = 'qrFPZrb9xSTWx3s21Ms8bbKbxLHgIYHdA+MvEEg0/d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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